Malicious PDF — malware analysis report

Static analysis result for SHA-256 135247ee07f24ee5…

MALICIOUS

PDF

82.1 KB Created: 2021-09-21 11:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2c5c99c05f46cf791812c7228ceb41e SHA-1: 6cf46effd0489f06a26b0a1686e68eb9b9fdd590 SHA-256: 135247ee07f24ee56c51ac53979569368f2740924d2bd8a5fafa28fceaabbd8e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://spartaksedlec.cz/spartaksedlec/userfiles/file/14256121371.pdf
    • https://cvssteelex.com/ckfinder/userfiles/files/21477754798.pdf
    • http://asiavent.com/UserFiles/file///faviselajuzekezirod.pdf
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64291436401.pdf
    • http://bookblog.kr/data/file/files/zowiwasej.pdf
    • https://lwim-ouargla.dz/ar/files/rafanugijejosaza.pdf
    • http://findmecakes.com/userfiles/files/19476806206.pdf
    • http://fgosvo.ru/files/files/81069126506.pdf
    • http://th-hl.com///upload/files/97268765017.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edd138bd12---80669116085.pdf
    • http://lemma-studio.pl/userfiles/file/kunexufabirem.pdf
    • https://parisnordmedical.fr/docs/file/legogosukewewixoruv.pdf
    • https://jotekonybakterium.hu/userfiles/files/26907938174.pdf
    • https://paintingwithapassion.com/nbloom/fckuploads/file/9454878640.pdf
    • http://archifolder.com/userfiles/files/natonenereguwepidegopu.pdf
    • http://hanart21.com/files/userfiles/file/towinizogijivifirowuxokaj.pdf
    • http://pescepiana.eu/userfiles/files/lexawul.pdf
    • http://dayuntang.com/assets/uploads/ckedit/files/20210907172336.pdf
    • https://menu2uplus.com/images/file/47064385705.pdf
    • https://chennothinterios.com/uploads/file/konowobuvekiwagal.pdf
    • http://footstepfloor.com/upfiles/files/kexoritumezene.pdf
    • http://sangtaoad.com/uploads/userfiles/file/rafaxalera.pdf
    • http://catherine-massage.com/ckfinder/userfiles/files/mibizojowokajunevogoram.pdf
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/gabezepegisesekipebo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=android+screen+size+in+pixels
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbf2.bin
3a9375279cf9a8d1379d5c43d730e3b1a6d7c792bffba3676a0ecfccf5e476c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF2 10388 bytes
font_01_sfnt_off0000f393.bin
7341c286ff8270528e9f8615b485935e903d1b8a35e2777b649f1bbb1bbaeea0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF393 18296 bytes
font_02_sfnt_off000122a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122A9 16792 bytes

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